Page 142 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

4 Masking: Use masking tape or a specialized solder mask damming material to protect surrounding areas of
the PCB from the repair process. This will ensure that the solder mask is applied only to the damaged area.
5 Application of Solder Mask: Apply solder mask material to the damaged area using a fine-tip applicator or
brush. Ensure that the solder mask covers the damaged area completely and forms a smooth, even layer.
Be careful not to apply too much solder mask, as excess material can cause bridging or other issues during
curing.
6 Curing: Cure the solder mask according to the manufacturer’s instructions. This typically involves exposing
the PCB to ultraviolet (UV) light for a specific duration to harden the solder mask material. Ensure that the PCB
is positioned correctly and that the entire damaged area is exposed to the UV light source.
7 Inspection: After curing, carefully inspect the repaired solder mask to ensure that it adheres properly to the
PCB and forms a consistent layer. Check for any defects, bubbles, or inconsistencies in the solder mask
material.
8 Cleaning and Finishing: Once the repair is complete and the solder mask has cured, remove any masking
tape or damming material from the PCB. Clean the repaired area again with isopropyl alcohol or PCB cleaning
solution to remove any residues or contaminants. Ensure that the repaired area blends seamlessly with the
surrounding solder mask.
9 Testing: After completing the repair, conduct electrical testing or functional testing to ensure that the PCB
functions properly and that the repaired solder mask does not affect the performance of the circuit. By following
these steps carefully, you can effectively repair damaged solder mask on a printed circuit board. However, it’s
important to note that solder mask repair requires precision and attention to detail, so if you’re not confident in
your abilities, consider seeking assistance from a professional or experienced hobbyist.

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CITS : E & H - Electronics Mechanic - Lesson 73 - 76